The 2 USRPs are connected via a SMA cable with 40 db attenuators and DC
blocker.
I have also played with the costas alpha, samples per symbol, gain mu,
frequency fine tunning and this is the best result I can get.

Dear All, I’m looking for a processing block to calculate the medium
value of a signal. In fact, I should implement the expression attached.
Is there anybody here who knows the block I’m looking for? Thanks for
your help.

That depends on your overall SNR. I’d suggest trying lowering your
transmit power, as the amplitude you are using is driving the RFX into
non-linearity, and with the raised cosine filter you are using, the
modulation is no longer constant envelope, so you are generating
unnecessary distortion. The RFX boards typically remain linear up to
an output amplitude of about 2000.

Similarly, on receive, it looks like you are using the default
mid-point gain of the RFX, which likely too high for a path loss of
only 40dB. I’d suggest experimenting with lower receive gains to see
if things improve.

I am using the latest gnuradio trunk and the
…/gnuradio-examples/digital/benchmark…
I have disabled all the data loggins but the rx_receiver.dat from the
/usr/local/lib/python2.5/site-packages/gnuradio/blks2impl/dqpsk.py to
reduce
the computational requirements.

I am using the latest gnuradio trunk and the
…/gnuradio-examples/digital/benchmark…
I have disabled all the data loggins but the rx_receiver.dat from the
/usr/local/lib/python2.5/site-packages/gnuradio/blks2impl/dqpsk.py to
reduce
the computational requirements.

Hello everybody. I was trying to use the gnuradio complex_to_float ()
block just to understand its functioning. Unfortunately, the conversion
not happened and apparently there was no problem. The code is below.
What’s the problem with this so simple code?
One more thing, it would be so helpful a dictionary with all
the gnuradio blocks and usage examples. Examples are fundamental to help
us reach a good level to be able to contribute for the gnuradio project,
without waste so much time. Thank you very much.

Hello everybody. I was trying to use the gnuradio complex_to_float
() block just to understand its functioning. Unfortunately, the
conversion not happened and apparently there was no problem. The
code is below. What’s the problem with this so simple code?

Hi Alysson,

I’ve attach a modified version of your code that works with GNU Radio
3.1 and 3.2. I suggest that you try using the 3.2 release.

If you happen to be running Ubuntu 9.04 (Jaunty) you can download
prebuilt binaries:

One more thing, it would be so helpful a dictionary with all the
gnuradio blocks and usage examples. Examples are fundamental to help
us reach a good level to be able to contribute for the gnuradio
project, without waste so much time. Thank you very much.